Amino(or amido)-phenyl-alkyl-benzazepine analgesics and narcotic antagonists

ABSTRACT

Compounds of the general formula:   D R A W I N G

United States Pa tnt n 1 Slletty I v 1451 March 6,1973

AMINO (ORAMlDOj-PHENYL-ALKYL- BENZAZEPINE ANALGESICS AND NARCOTIC ANTAGONISTS [75'] lnventor-z Bola Vi tlial Shetty, Bombay, India {73]v Assignee: Pennw'alt Corportntion; Philadelphi a,l a. [221 Filedz M66621, 19.72 211" App1.No.: 238,637

RelntedlLS; Application Data 4 [63] Continuation-impart of Ser. No. 711,897, March 1 1 1968, abandoned.

152] US. Cl....260/239 BB, 260/2393 B; 260/240 R,

260/240 0,260/3463, 260/465 F, 260/471 A; 260/5 19, 260/521 R, 260/544 M, 260/5705R. 260/612 0.260/6130,

3,393,192 9/1968; wai ereiaiwr ..260/239BB' 2,520,264 8/1950 Walter ..260/239 BB 2,684 962 7/1954 Walker .260/239 12/1969 Tokolics et al ..260/239 Primary ExaminerA1ton D. Rollins Au0m ey-Char1es E. Feeny 571 ABSTRACT 2 Compounds of the general formula;

or acid addiiion salts 'thereofwherein R is aminoplienyl-lowcr alkyl.v I 1owr ulkunoylumidophcnyl-lowcr alkyl, I methyl aminophcnyl-lower alkyl, ethylamin0phcnyl-1nwer -a1kyl, or dimethylaniinophenyl-lower alkyl in which said amino moiety is either ortho, meta, or

para to said lower alkyl moiety; R and R are independently H or lower alkyl; R and R are inde- V pendently'l-l 0r OH or lower alkoxy. The c'ompounds ar useful as analgesics and narcotic antagonists.

v 21 Claims, No- Drawings 1 AMINO (on mmm-PimuYL-ALitvL- ssuzszsrms ANALGESICS nn macorrc ANTAGONISTS This application is a continuation-in-partof Ser. No. 71 l ,897 filed Mar. l l, 1968, and now abandoned.

This invention relates to benzazepines that are useful as agents for producing analgesia as well as serving as antagonists for narcotics such as morphine. The compounds have the general formula:

or acid addition salts thereof wherein R is aminophen'yl-lower alkyl, lower alkanoylamidophenyllower alkyl (e.g. p-propionarnido-2-phenyl-l-methylethyl, p hutyramidophenethyl, and the like), methylaminophenyl-lower alkyl,iethylaminophenyl-lower alkyl,-or dimethylaminophenyl-lower. alkyl in each of which said amino or amido group is either ortho, meta, or para to said-lower alkyl group;R"and R are independently H or lower alltyhll and R are independently H or OH or lower alkoxy.

' Being organic bases the'above, compounds readily form salts withorganic or inorganic acids such as hydrochloric, male'ic, tartaric, sulfuric, and other nontoxic acids to form pharmaceutically acceptable acid addition salts.

Preparation of 7-methoay-l,2,4,b-tetrahydro-MLli-hunmzophin nofj-om (cnmso orno- -cn=" "CH3 on m J-coon NnHN lla I O n (MUN ltnNl/lh Method l llBr/AcOlIl NH: mom/mo smog N-lillr s 1 cino- I Nll 3,4-Dimethyl anisole BA-Diniethylphenol (1 kg, 8.2 m) was suspended in water (3,3 00 ml.) and the stirred mixture was warmed to 45' C. The heat source was-removed. With constant stirring, dimethyl sulfate (l,3l0 gm., 10.4 m) and a solution of sodium hydroxide (576 gm., 14.4) in water (1,480 ml.) were added in alternate portions so that the heat of reaction maintained the temperature at 47 50 C. The addition took about 5 hours. The resulting mixture was stirred at room temperature for a further 3 hours and then it was allowed to stand overnight at room temperature.

r The reaction mixture was extracted with chloroform (1 X 800 ml., 3 X 400 ml.). The combined chloroform layers were washed with water (3 X 200 ml. After drying the chloroform solution over anhydrous magnesium sulfate, the solvent was evaporated on a rotatory evaporator at 15 mm. The light yellow oil which remained was distilled at 7 mm pressure and the fraction boiling at 85 88 was collected. wt. 942 gm.

4-Methoxyphthalic acid ,3,'4-D im'ethylanisole (250 gm., 1.84 m) was suspended in water (7 I.) at C. Potassium permanganate" (2 ltg'., 12.6'n'i) was added portionwise at a rate which maintained the temperature between 5C. The addition was complete in 5 hours. The reaction 3 4-Methoxyphthalic arihydride filtration, washed with petroleum ether (40 4 60) and air-dried. wt. 649 gm, m.p. 89 94 C.

The acetic .anhydride mother liquors were evaporated to dryness at mm. The residue was dissolved in ethyl acetate (1 l.) and the solution was bonate solution (2 X 500 ml.), water (500 ml.) and saturated saline solution (500 ml.). The ethyl acetate was dried over anhydrous magnesium sulfate and evaporated at 15 mm. The solid obtained had m.p. 89 -93. wt.= 103 gm.

4-Methoxy-o-xylenol v Lithium aluminum hydride (75 gm., 1.98 m) was suspended in tetrahydrofuran (2 l.) in an atmosphere of nitrogen. at room temperature. To the stirred suspension was added dropwise asolution of -4-methoxyphthalic anhydride (250 gm., 1.40 m) in tetr'ahydrofuran (500 ml.) during 3'hours. The resulting reaction mixture was warmed'to reflux for 2 hours and then it was allowed to stand at room temperature overnight. Water (75 ml.), 15% sodium hydroxide solution (75 ml.) and water'(225 ml.) were added successively to the stirred, ice-cooled reaction mixture. Stirring was continued for a further hour, then the salts were filter ed off. The filtrate was dried vover magnesium sulfate. The dried solvent was evaporated at 15 mm. A

- washed with water (2 X 500 ml.) saturated sodium carcolorless oil was obtained which solidified on standing I 146 C/.025 mm.

Anal. Calc. for C l-1, 0 C, 64.27; H, 7.19. Found C,

4-Methoxy-a,a'-dibromo-o-xylene 4'-Methoxy-o-xylenol .(250 'gm., 1.49 ni was suspended in dichloromethane (2.5 l.) at room, temperature'. Phosphoroustribromide (417 gm., 1.49 m) solution (500 ml.), water (2 X 400 ml.) and saturated brine solution (400 ml.). The dichloromethane solution was dried over magnesium sulfate. Evaporation of the solvent at .15 mm pressure afforded a solid mp. 48 t.= 430 grn. a

The product was recrystallized from petroleum ether Anal. Calc. for C H BMD: C, 37104; H, 3.43; Br,

54.36. Found:C,37.l5;H,3.60;Br,54.42.

4-Methoxy-o-phenylenediacetonitrile Finely ground sodium cyanide/(73 gm., 1.48 m) was suspended indimethylsulfoxide (500 ml.) by means .of a Vibro MixerT A solution of 4-Methoxy -a.a'- dlhl'OfllO-UrXYiCflC (113 gm., 0.384 m) in dimethylsulfoxide (200 ml.) was added dropwise to the cyanide suspensiom-The'iht'e'rnal temperature was kept at 35 38 C byjmeans of an ice bath. The addition took 15- minutes. Agitation of the reaction was continued for a further 1 k hours. The reaction mixture was poured into water (4 1.). The aqueous mixture was extracted with ether .(2 X l 1., 3 X 500 ml.) and the combined ether extracts were washed with dilute hydrochloric acid (6N) (2 X 500 ml.), saturated sodium carbonate solution (1 X 500 ml.), water (3 X 500 ml.) and saturated sodium chloride solution (2 X 500 ml.). The ether layer was dried over magnesium sulfate. The' dried ethereal solution was evaporated to an oil which was distilled and the fraction with boiling range (.1 mm) was collected. wt. 53 gm. The oil obtained was crystallized from ether (650 ml.) to give 45 'gm. (m.p. 51 53). A second crop of 5.8 gm.'(m.p'.'49 51)was obtained. r I

Anal. Calc. for C H N 0': C, 70.78; H, 5.48; N,

14.90. Found: C, 70.95; H, 5.41; N, 15.05.

4-Methoxy-ophenylenediacetimide perature for 4 hours. The precipitated solid was filtered and'washed with acetic acid until the solid was colorless. The solid'was washed with acetone and air dried. wt.= 196 gm. I

' The above solid was addedto water (3.5 l.)-which hadbeen preheated to 85. When the solid had been dissolved anhydrous sodium acetate (48 gm 0.59 m) was added during five minutes. The temperature rose to 93 and'it was maintained at 92 93 for 1 hour. The heat source was removed and the reaction was stirred for 45 minutes while the temperature dropped to. 70. The warm reaction was filtered to give the required imide. n1.p. 183, wt. 105 gm. The imide was recrystallized from absolute methanol m.p. 181-183 I Anal. Calc. for C H NO C, 64.38; H, 5.40; N,

I 4 Methoxy-o-phenylenediacetimide (50 gnr, 0.245

m) was added portion-wise during 20 minutes to a solution of borane in tetrahydrofuran l 1., l 'm in 8H5) which was being stirred at 10 C in an atmosphere of nitrogen. The solution was stirred at room temperature for 5 hours. Hydrochloric acid (6N, 20 ml.) was added to the stirred, i'ce-cooled'rea'ction. during 45 minutes.

The initial foaming subsided anda further 230 ml. of hydrochloric acid (6N) were added during-30 minutes. The suspension was stirred at room temperature for 16 hours and then the insolubles were filtered. The filtrate solid was 'treated with Water (500 ml.). The aqueousmixture was filtered and the filtrate was basified with percent sodium hydroxide solution. The precipitated oil was extracted into benzene (l l.) and the benzene extract was dried over magnesium sulfate. Evaporation of the benzene afforded an oil (32 gm.) which was distilled at 0.05 mm. The fraction with the boiling range 90 93 was collected wt. 28.0 gm. The amine was analyzed as the maleate salt which was recrystallized from methyl ethyl ketone. in.p. I40 l4l.

Anal. Calc. for C,,H NO C H Q. c, 61.42; H,

6.53; N, 4.78. Found: C, 61.52; H.674; N, 4.93.

Method it absolute ethanol before it was added; The bomb was heated until the solution temperature was 90 C and the hydrogen pressure was 1000 psi. Stirring was begun and heating was stopped. The reduction was carried out at 1000 700 psi and the stirring was continued until the temperature had dropped to 30? C. The

hydrogen pressure reduction was 1760 psi. The catalyst was removed by filtration and the solvent was evaporated. The residual oil was distilled and the fraction with the boiling range 82 86 (0.01 mm) was collected. wt. 24 gm.

7-Hydroxy-l .2,4,5-tetrahydro-3H ,3-benzazepine 7-Methoxy-l ,2,4,5-tetrahydro-3H ,3'-benzazepine gm., 0.085m) was refluxed with 48 percent aqueous hydrobromic acid 120 ml.) for 3 hours. The excess acid was evaporated in vacuo and the residual solid was ROUTES 'ro s-suasn'r urai) BENZAZEPINES cmo l LAH N -a H Br 1 air;

CH3Q

RX I

Roux B Y l l N1 VIll ' sorption ceased after 'iminutes with adrop in pres- EXAMPLE 1.

EXAMPLE 2. I

' B-(p-Aminophenethyl)-7hydroxy-l,2,4,5-tetrahydro- 3H,3-benzazep ine (Method E) I 3-(p-Aminophenethyl)-7-methoxy-l ,2,4,5-

(Method E) l tetrahydro-3H.3-benzazepine dihydrochloride (l1.3 gm., 0.0306 m) was suspended in 48 percent aqueous hydrobr omic acid (175 ml.) and refluxed for 2 hours. The excess acid and water were removed in vacuo. The

ZOresidual solid was dissolved in water (250 n l-l.)'and basified with potassium carbonate solutio'n. The

3-(p-Aminophenethyl)-7-methoxy-l ,2,4.5-tctrahydro- I 3H,3-benzazepine A solution of p-nitrophenylacetic acid (ll.7 gm., 0.064 m) in tetrahydrofuran (50 ml.) was added to a solution of 7-methoxyl ,2,4,5-tetrahydro-3H,3- benzazepine. (10.3 gm., 0.058 m) in tetrahydrofuran (50 ml.) at room temperature. -A solution of dicyclohexylcarbodiimide (14.5 gm., 0.0705 .m) in. tetrahydrofuran (50 ml.) was added immediately to the reaction and stirring was continued for 4 hours. Acetic acid (10 ml.) was added to the reaction and then the solids were removed by filtration. The solvent was evaporated in vacuo and the residue was treated with 5 diethyl ether 150 ml.) and benzene (150 ml.). The insoluble solids were removed by filtration and washed with benzene (200 ml.). The solids were dissolved in tetrahydrofuran (250 ml.) and filtered from a small quantity of dicyclohexyl urea. The benzenezether extract was washed withpotassium carbonate solution, and hydrochloric acid (3N). The'tetrahydrofuran ex- 3 tract was washed with potassium carbonate solution. Theextracts were combined and'evaporated in vacuo to give the crude amide. wt. 25 gm. The crude amide was dissolved in methanol (200 ml.) and hydrogenated at 60 psi over platinum. oxide (1 gm.). Hydrogen abconverted-to the hydrochloride salt and recrystallized from methanol: diethyl ether'( 1 :2). m.p. 309.5" wt. 8.7 gm. I

Anal. Calc. for C l-l N tl ZHCl: C, 60.84; H, 6.81; N, 7.89; Cl, 19.95. Found: C, 60.62; H, 7.03; N,

'8.06;Cl, 19.85. Compound 725-061.

EXAMPLE 3.

3-( 2-p-Aminophenyll -methylethyl )-7-methoxyl ,2,4,5-tetrahydro 3H,3-benzazepine 7-Methoxyl ',2,4,'5-tetrahydro-3H ;3benzazepine (10 gm., 0.0565'm), l-(p-nitrophenyl)-2-propanone (ll gm, 0.0622 m) and p-toluenesulfonic acid (0.2 gm.) were dissolved in toluene (100 ml.) and refluxed for 20 hours. A Dean and Stark apparatus was attached andthe eliminated water-was collected. The toluene solution was diluted with methanol (200 ml.) and cooled to 10?. Sodium borohydride (8.5 gin., 0.226 m) sure of 17 p.s.l. The catalyst wastetnoved by filtration was added portionwise to the stirred reaction during 20 was evapmaled "3 vacuo' res'dne minutes. The reaction was stirred at room temperature was dlswlved m hydroshlqrw s 1500 ml) f0! 4 hours. Water 100 ml.) and diethyl ether 100 and filtered l some acid solution ml'.) were added cautiously. The organic layer was 3 W S if Fi F 3": t (a Pasified with separated and washed with dilute hydrochloric acid. A Sodlum Yd QW-I T P at Pl' gummy precipitate fonned which was separated and was extraciedinw chloroform The chlqwfbm extract then: basiridd with sodium hydroxide solution. The was dried Over magnesium u f e s p a n SO'aqueous acid sd'lmidhwds also basifled. The alkali in- 9 give the .m 8 solu'bles were combined and extracted into diethyl m d was dissolved in hy ether. The ether solution was dried over magnesium 150 and added dI'OPWiBQ f ve aio 0f h sulfate. Evaporation of the solvent afforded a dark red um aluminum hydride (5. gm., 0.0132 m) in diethyl oil. wt. l0.'6grn. The oil was purified by chromatogfl (175. at u h 8 t that g ntle r fluxw'as raphy' on silica gel. Elution of the column with maintained T-hereaction was refluxed for 2lhours. benzenezdiethyl ether (lzl) afforded 7-methoxy-3-[l- The complex was decomposed by the successive addimethyl-Z-p-nitrophenylethyl1-1 ,2 ,4,5-tetrahydro-3H,3- tion of water (5 ml.). l5 percent sodium hydroxide be'nzazepine as an oil. The amine was converted tothe solution (5 ml.) and water (15 ml.). The solvents were hydrochloride salt and recrystallized from methanol. filtered and dried over magnesium sulfate. Evaporation 6o m.p. =223- 230. wt. 3.9 gm.- I i I of the solvents in vacuo afforded an oil which was con- Anal. Calc. for C li Nw HCl' C,' 63.74; H, 6.69; verted to the dihydrochloride salt and recrystallized N 1 Foundi from methanol to give the dihydrochloride of the title l L i I compound. m.p. 264.5 -265.5.wt =='1l.l gm. I The amine hydrochloride (2.4 gm., 0.0064'm) was Anal Calc. for C l-l Nfl ZHCI; C, 61.79; H, 7.10; dissolved on methanol (75 ml.) containing I cone. N, 7.59; Cl, 19.20. Found: C, 61.63; H, 6,86;-N, hydrochloric acid (,ml.) and the solution was charged 7.6. l;Cl, l9.45.Compound 673-98A. with 5% palladium-charcoal catalyst. The nitro group precipitated solid was filtered and dried. The solid was EXAMPLE 4.

3-(p-Acetamidophenethyl)-7-methoxy-1,2,4,5- tetrahydro-3H,3-benzazepine Triethylamine (11.0 gm, 0.108 m) was added to a suspension of 3-(p-aminophenethyl) 7-methoxyl,2,4,5-tetrahydro-3H,3-benzazepine dihydrochloride (13 gm., 0.035 m) in chloroform (200 ml.). The mixture was stirred and cooled with an ice-water bath. Acetyl chloride (3.3 gm., 0.042 m) was added dropwise during 5 minutes and the reaction was stirred at room temperature for 1 hour. The insoluble material was filtered to give the title compound as the hydrochloride salt. m.p. 289 290. wt. 8.0 gm. V

Anal. Calc. for C l-1, 19,191 HCl: C, 67.28; H, 7.26;

N, 7.47; CI 9.46.'Found:C, 67.10; H, 7.56; N, 7.53;Cl9.34. Compound 753--850A.

The crude sulfonamide (43 gm, 0.135 M) was dissolved in acetone (1100 ml.). Anhydrous potassium carbonate powder (135 gm.) was added and the reaction was stirred and refluxed. Ethylbromoacetate (33.? gm., 0.202 M) was added in four equal portions at 30 1 minute intervals. After stirring and refluxing for hours the salts were filtered from the cooled solution. Evaporation of the acetone gave an oily residue which consisted mainly of the alkylated amine. The ester function was hydrolysed by refluxing the oil with ethanol (95 percent, 900 ml.) and sodium hydroxide (10 percent aqueous, 270 ml.) for 6 hours. The ethanol was removed on the rotatory evaporator and the aqueous residue was diluted with water (1 1.) until a clear solution was obtained. The solution was washed with diethyl ether and then it was made acid with concentrated hydrochloric acid. The oily precipitate was extracted into ether and then the ether solution was washed with-sodium bicarbonate solution. The bicarbonate solution was separated and acidified with concentrated hydrochloric acid and the precipitated acid was isolated in diethyl ether. The ether solution was dried over magnesium sulfate. Evaporation of the solvent afforded N-[2-(3-rnethoxyphenyl)-1- methyllethyl-N-toluene-p-sulfonyl glycine as a viscous oil which resisted crystallization. Wt= 40.5 gm.

GENERAL METHOD-.KLKYL soas'rl'ru'rtort ON. 'rnaazarma RING A solution of ,p-toluenesulfonyl chloride (28.8 gm., 0.15 M) in benzene (100 ml.) was added dropwise to a solution of 2-( 3-methoxyphenyl l -meth'ylethylamine (23 gm., 0.139 M) and triethylarnine l 3 gm.-, 0.15 M) in benzene (200 ml.) during minutes. The reaction was stirred at room temperature for 4 hours. The precipitated triethylamine hydrochloride was filtered off and the benzene solution was washed withhydrochloric acid 3N water and saturated brine. The benzene solution was dried over magnesium sulfate. Evaporation of the solvent afforded N-tolueneqa-sult'onyl-2-(3-methoxyphenyl)-l-methylethylamine as an oil. Wt=42 gm.

The crude acid (40 gm, 0.106 M) was refluxed in benzene solution (500 ml.) with thionyl chloride (25.3 gm., 0.212 M) for 9 hours. The excess thionyl chloride and solvent were removed on the rotatory evaporator.

The crude'acid chloride was dissolved in methylene dichloride'( 100 ml.) and added dropwise'to a suspension of aluminum ch1oride"(l7.4 gm., 0.13 M)- in methylenedichloride' (300 ml.) which had been cooled to C. The addition took 3 hours. The reaction was stirred at 65" for'afurther 7 hours and then it was stirred while warming to 15C during 12 hours. The .re'action mi'xture was poured onto ice (1500 grad/con centratedhydrochlorie acid ml.) and the mixture was stirred for 1.5 hours. The methylene chloride layer was separated and washed with water, sodium bicarbonate solution and saturated'brine'. Evaporation of the solventafl'o'rded'an oil. Wt 37 gm. The'oil was pu rifled by chromatography on silica gel. Elution of the column with acetonezbenzene (1:40) afforded the crude title compound which was purified by crystalliza- .tion from absolute methanol. Wt l 1.4 gm. m.p. 1 19 121 .5. Anal. Calcd. for C H NO S: C, 63.49; H, 5.89; N,

3.90;S, 8.92 i Found: C, 63.77; H, 6.04; N, 3.61; S, 8.93 Further elution of the column afforded the 9- methoxy isomer which was crystallized from absolute methanol. Wt= 1.5 gm. m.p. 127- 128.

Anal. Calcd. for C, H NO,S: C, 63.49; H, 5.89; N,

3.90;S, 8.92 Found: C, 63.41; H, 6.03; N, 3.65; S, 9.16

l -Hydroxy-7-methoxy-4-methyl-3-toluene-p-sulfonyl' l,2,4,5-tetrahydro-3H,3-benzazepine Sodium borohydride (1 gm., 0.0264 M) was added during 5 minutes to a suspension of 7 methoxy-4- methyl-3toluene-p sulfonyl-l,2,4,5-tetrahydro-3H;3-

benzazepin-l-one 7.5 gm'., 0.0208 M) in absolute ethanol (100 ml.) at'room temperature. The mixture was warmed to 60 during 30 minutes and then the heat source was removed. After stirringfor a further 3 hours at room temperature the reaction mixture was poured onto'ice/concentrated hydrochloric acid (500 ml./ ml.).The precipitate was extracted into chloroform. Evaporation of the chloroform afforded aviscous oil 0 which, on trituration with diethylether afforded a solid.

Wt 5.4 gm. m.p. 83 87. The solid was crystalpound. m.p. 84--87" Anal. Calcd. for C H NOfiz-C, 63.14; H, 6.41; N,

3.88; S, 8.87 Foundr C, 63.09; H, 6.40; N, 4.00; S, 9.11

8-Methoxy-2-methyl-3 toluene-p-sulfonyl-1,2-dihydror 3H,3-benzazepine I l-Hydroxy-7-methoxy-4-methyl 3-toluene p sulfo- I ny l-l ,2,4,5 tetrahydro-3H,3-benzazepine .(7 'gm.,

0.0194 M) and p-toluene sulfonic acid. (20 mg.) were 'dissolved in benzene (80 ml.) and the solution was refluxed for 1.5 hours. The solvent was condensed over a Soxhlet.tube containing Linde Type 3A molecular sieves 1/16 inch). The solvent was evaporated and the lized from diethyl ether to give the pure title comwas filtered off and the filtrate was evaporated to dry ness. The residue was triturated with diisopropyl ethyl to give the title compound as a solid. Wt 4.3 gm. The solid was crystallized from absolute methanol. m.p. 86 89 Anal. Calcd. for

4.06; S, 9.28 Found:.C, 66.10; H, 6.88;N, 3.97; S, 9.29

8-Methoxy-2-methyl- 1 ,2,4,5-tetrahydro-3H,3-

benzazepine I 8-Methoxy-2-methyl-3-toluene-p-sulfonyl-1,2,4,5-

tetrahydro-3H,3-benzazepine (1 gm, 0.003 M) was suspended in liquid ammonia (35 ml.). Sodium (0.15 gm.) was added portionwise until the blue color persisted. After a further 15 minutes ammonium chloride (2 gm.) was added and the ammonia was allowed to evaporate. Water was added and the insolubles were extracted into diethyl ether. Evaporation of the ether afforded an oil. Wt 0.62 gm. The title compound was isolated as the hydrochloride salt and the salt was crystallized from iso-propanol. Wt 0.28 mg. m.p.

residue was purified by chromatography on'silica gel.

Elution of the column .with acetone:be.nzene (3:100)

afforded an oil which solidified on trituration with diisopropyl ether to give the title compound. Wt 5.0

gm. m;p.=77-79 AnaLCalcd. for C H NO S: C, 66.43; H, 6.16; N.

4.08;S,9.34 Found:C, 66.26;H,6.28;N,3.93;S,'9;23. Further elution of the column afforded a solid which was crystallized from absolute methanol. Wt gm. m.p.== 177 182 FoundrC, 66.20; H, 6.38; N, 3.95; S. 9.52

8-Nlethoxy-Z-methyl-3-toluene-p-sulfonyl-l ,2,4,5-

I tetrahydro-3H,S-benzazepine' A solution of 8-rnethoxy-2-methyl-3-toluene-p-sulfonyl-l,2,-dihydro-3H,3-benzazepine (4.7 gm., 0.0137 M) in acetic acid (50 ml.) was hydrogenated over5 percent palladium-charcoal (0.4 gm.) in a :Parrap- 6 paratus atan initial pressure of 37 p.s.i. The adsorption of hydrogen was complete in 2.5hours. The catalyst tetrahydro-3H,3-benzazepine; Compound 778-033. v

' EXAMPLE 6.

3-(p-Aminophenethyl)-8-hydroxy-2-methyl- 1 ,2,4,5- tetrahydro-3 H ,3-' benzazepine By following thepro cedure of example 2 3-(paminophenethyl)-8-methoxy-2-methyl-1,2,4,5-

'tetrahydro- SH,3-benzazepine is demethylated by refluxing with,48 percent aqueous hydrobromic acid. Thetitle 'compound is obtained from the hydro-bro midef' salt by neutralizing with potassium carbonate solution. V

EXAMPLE 7. 3-(p-Aminophenethyl)-7-methoxy-1,2,4,5-tetrahydro-- 3H.3-benzazepine-methiodide lodomethane (1.5 gm., 0.0114 M) was added to a solution of B-(p-arninophenethyl)-7-methoxy-l 2,4,5-

tetrahydro-3H,3-bcnzazcpine (3 gnu, 0.0-103M) in acetone (40ml). The acetone was decanted from the gummy precipitate and the gum-was triturated with ethyl'alcohol percent) to give the solid methiodide.

The salt was recrystallized from water. Wt 0.8 gm.

m.p.=236-239. .Anal. Calcd. for-C l-l lN oz C, 54.79; H, 6.21; l,

2895; 14.6.39 F0tmd:C,54.64;H,6.29;l,29.13;N,6.39.

CllriO llt) Ill)

.titl n ADDITIONAL EX AMILEH otnon,

(CHs)2N--- CHaC llr" IlaN-* "cHzCHr' ill) ll N (twin 3-(m-amlnophenethyU-7- methoxy-l.2,4,5-totrahydroamlhenzszeptne.

3-(0-amlnophenethyD-7- methoxy-t,2,4,5-tetrahydro- 8H ,a-bonzaloptne.

3-(O-amtnophenethyD-7-hydroxy t,2,4,8-tetrahydro-3H,3' benzuepine.

v H praminoplieuethyli-8= 'methoxy-Z-methyl-1,14,5-

tt'trah yttro-3 I! ,S-bcnzazepino.

PH ARMACOLOGICAL ACTIVITY BENZAZEPlNE COMPOUNDS Compounds of the present invention have been evaluated in experimental animals for analgesic activity and ability to antagonize the action of strong narcotic analgcsics. It has been possible through use of conventional testing methods in animals to demonstrate various degrees of these activitiesby one or several methods 60 and routes of administration at does levels which do not result in gross toxic manifestations. ln addition, other pharmacological properties of representative compounds of this invention have been detected, such as ,antihistaminic and anticholinergic activity. Recognized indications of drug addiction typical of the opiates have not been observed following administration to a morphine dependent monkey indicating a lack of addiction liability ,for these benzazepine compounds. Thus,

results of pharmacological evaluations support the contention that the benzazepine compounds of the formulae disclosed in this application are of value as narcotic antagonist analgsicsw increasing dosage characterized by depression, ataxia, reduced respiration, exophthalmos, salivation, lacrimation, vasodilation, cyanosis .and mydriasis. Also common with all compounds was development of moderate to s'evere'clonic convulsions and death of the animals Results was attributable to respiratory failure. I Analgesic Activity 7 Antihistaminic and Anticholiner gic Activity g Table III provides a summary of the relative an- Table l provides a summary of the results obtained tihistaminic and an'ti-ch'olinergic activity of when representa i e comp n Ofihis invention were benzazepine compounds as demonstrated through use tested for analgesic activity by the methods described. of isolated segments of guinea pig ileum. It is apparent Th narcotic antagonist analgesic pentazocine and the. from these results that positive antihistaminic actionv narcotic analgesics morphine andcodeine are included can be elicited with the compounds listed in the table, for comparison. It is evident from this comparison that the most potent of which, (SR673-98A) is approxithe majority of-compoun'ds which exhibit activity at mately times less active than the a'ntihistam-inic standose levels below those producing toxic manifestations, dard diphe nhydramine. ,Weak anticholinergic activity i.e., less than the highest non-symptomatic dose relative to atropine was exhibited by these compounds.

'IABLE I [Anhlgcsiv activity of lwm azvpinc cunnwunds] i liot plate, \Vritliiniz, N51. w H l so. E1350 nip/kg. tum/kg. mgI/kg. mg./kg. P0" 11"" i-o Il Nnml' v T-motl1yoxy3(p ucetamidoplit'ncthylH,2;4,5-tcti'ahyrlro-3li,3-lwnzazepim vhydrochlo- I I 8'3 3; 1.000 0 i, 32 3- pnrn-nminophonylethyl)-T-m0th0xy-1,2,4,5-tutrahyd dihydrn- 1 i 1 I i (*hlol'itltfl. x00 1B 445 5: s5 17 45 -b Y 3(p-aminophvnothyl) 7-hydr0x 31-6. 56 1,000 121 315 37 120 lontazocinc.; 316 316 -80U 500 316 100 Morphinc 56 ll) -8OU 250. j 14' 2.5' Codeine 100 3;! 540 104 '20 12 f (ompound number, SR753'-850A.

(ompountl number, SR673-J8A. P, (ompound number, SR725-6IA. *llNSl)= Highest non symptomatic dost.

*.IO=Pvr Os. "1P=Intraperitonual. I "3?=Subcutnncous. (HNSD),' are effective primarily by the parenteral TABLE ll route. An exception is compound SR673 -98A,which-is .active by the oral "route. The predominance of Nalz'conc s A w y ofBenZaZepme' parenteral efficacy is evident by both the hot plate compounfjs method where the intraperitoneal route was'us'ed and Antagonism Antagonism by the writhing method with'adm nistration by thesub- 40. of of cutaneous route. The most active compounds'wer'e g f 'f gg SR673-98A and SR753-85OA. ln addition, these com- Name p0 0 I I S C tt'x pounds also exhibit the greatest separation between effective dose and toxicor lethal doses indicating a more 7 favorable therapeuticmdex. v r V phenylethyh- Themost active compounds'listed in Table l are 1 y ,tetrahydrocomparable to codeine by the hot plate method of test- GH'LbenzazePine' ing and are 6 to 10 times more-active than pentazocme f y v c on e by the ntraperitoneal route n this test. Compound Pemaiocine SR673-98A which e'xhrbrtsactrvtty by the oral route'm 5 Morphine Codeine s I. the wr thing te s approximately twice as active as Nalorpfime Approximately pentazocmc. 2() l00 times The ben'zazcpine compoundgiven in Table ll is an mor active than compounds example showing narcotic antagonist activity detcrlisted above mined by two methods. Inhibition of oxymorphone mydriasis in the mouse providedqualitativeevidence of antagonist activity whereas ,inh b tion of morphine |P='|n"apcrimnea| analgesia in the rat permitted semi-quantitative expresu s c =s sion' of antagonism. Narcotic antagonist activity was v demonstrated for the benzazepine compoundin Table TABLE ll b both ofthe test methods. 0 oun R 8 y C mp S 6739 A Antihistamine and Antlcholinergic Activity of appears to be a more potent antagonist than pena Benzazepme Compounds tazocme. No compound possessed activity approaching that of nalorphine, including the standard pentazocine. Conc. for 50% Cone. for 50% In addition to therapeutic applicationof these comf d l .t. t t h b f Acetylcholine Hlstamlne poun s as ana ges cs, n arcoac an agonis s ave een 0 Compound lg/20 m! 8/20 ml value n treatment-ofnarcoticaddiction. I

For all' benzazepine compounds listed, various SR 9 54 I degrees of similartox c manifestat ons occurred with SR 725-6lA 840 100 Atropine 0.0035 37 Diphenhydramine 3.3 0. l 2

EXAMPLE 8.

3'(p-Aminophenethyl )-2-methyl- 1 ,2,4,5- tetrahydro-3H,3-benzazepine (Cpd. 786-737) N-Toluene-p-sulfonyl-l-methyI-Z-phenylethyIamine Dextro amphetamine (200 g) and trie'thylamine (164 g) were dissolved in l500ml. of benzene. A solution of p-toluene sulfonyl chloride (310g) in 500ml. of

- benzene was added dropwise to the cooled solution during one hour. The reaction mixture was stirred for three hours at room temperature, then allowed to stand for approximately 16 hours (over night) at room temperature (approximately 20 C). The salts were filtered off and the benzene solution was washed with dilute HCl, water and brine. Evaporation of the solvent afforded an oil. d-N-toluene-p-sulfonyl-N-( I-methyI-Z-phenyl) ethylglycine Y The crude N-toluene-p-sulfonyl-l-methyl-2-phenylethylamine (240g) was dissolved in 4. liters of acetone. Finely ground potassium carbonate (750g) was added and the suspension was brought to reflux. Ethylbromoacetate (208g) was added in six equal portions at 20 minute intervals. The reaction was refluxed approximately 16 hours (over night). The acetone solution was filtered and evaporated to an oil which was dissolved in 95 percent ethanol (4.8 liters) containing percent aqueous NaOH (1 liter). The solution was refluxed for six hours and then permitted to'stand at room temperature for three days. The ethanol was evaporated and the oily salt was'dissolved in water (8 liters), washed with ether and acidified with concentrated l-lCl. The. oily precipitate wasextracted into ether, washed with sodium bicarbonate and the bicarbonate layer was acidified with concentrated HCl. Theprecipitated acid was isolatedby ether extraction.

Evaporation of the ether afforded a solid having a melting point of 1l4-l l6 C. The solid was recrystallized from benzene/cyclohexane (2 50/300ml) to give a melting pointof 1 -1 18. I

d-N-Toluene-p-sulfonyl=N-(l-methyls2-phenyl) ethyl- I methylene chloride (2 liters) at 70C during l. 5 hours. The reaction was stirred for 24 hours-as it warmed ,to.

+10 C. The suspension was poured into ice (4kg) water (4 liters), concentrated HCl (700ml) and stirred for 1.5 hours. The methylene chloride layer was separated and the aqueous layer was washed twicewith methylene chloride'(500ml each). The methylene chloride layers were combined and washed with water, dilute NaOH solution. water and brine. The reaction product was dried over M gSO the solvents evaporated and the solid recrystallized from 95 percent ethanol several times. d-l-Hydroxy-4-methyl-B-toIuene-p-sulfonyl-l1,4,4- tetrahydro-3H,3-benzazepine d-4-Methyl-3 -toluene-p-sulfonyl-l ,2,4,5-tetrahydr o- 3H,3-benzazepin-lone (155g) was suspended in 95 percent ethanol (2 liters) and sodium borohydride (193) was added. The reaction was warmed to C during-30 minutes and then stirred while cooling for three hours. The ethanol solution and the suspended solid were poured cautiously with stirring into 6 liters of icewater/250ml concentrated HCI. The gummy alcohol was-extruded into chloroform. Evaporation of the chloroform afforded a solid. d-2-Methyl-3-toluene-p-sulfonyll ,2-dihydro-3H,3- benzazepine d-l -Hydroxy-4-methyl-3-toluene-p-sulfonyl-l ,2,4,5- tetrahydro-3H,3-benzazepine was dissolved in benzene (1 liter) containing p-toluene sulfonic acid as a catalyst (lg). After refluxing in a Dean and Stark separator during which a total additional quantity of p-toluene sulfonic acid amounting to 3g were added to the reaction, the benzene solution was washed with dilute NaOH to remove the catalyst, and the solvent was evaporated to givean oil. d-2-Methyl-3-toluene-p-sulfonyll ,2,4,5-tetrahydro- 3H,3-benzazepine d-2-Methyl-3-toluene-psulfonyl-l,2-dihydro-3H,3- benzazepine (l 17.5g) was suspended in acetic acid (1 liter) along with 10g of 5 percent Pd/C. The mixture was hydrogenated at room temperature in a 2 liter flask on a Parr apparatus at 45 psi. After 6.5 hours, the flask wasflushed with nitrogen and the solution was filtered through a pad of Celite. Some crystallization had occurred and the cake was washed with chloroform.

Evaporation of the chloroform afforded a solid melting -at l ll-l'l3.0 C. After standing approximately 16 hours (over 'night) a solid crystallized from the acetic acid. The solid was filtered, melting point ll2-l 14 Theacetic acid was removed by evaporation to a volume of 200m] and the precipitated solid wasfil tered, meltingpoint ll2-ll4. C. The filtrate was evaporated and the solid residue was washed with isopropyl ether to give a solid, melting point ll1-ll 15C. 7 (-)-2-Methyl-l ,2-,4,5-tetrahydro3H,3-benzazepine A sodiu-m' naphthalene solution in l,2-dirnethoxy ethane (3L) was prepared from sodium (39g) and naphthalene (236g) at 25-35 C during 2 hours. Solid d--2-methyl-3-toluene-prsulfonyll ,2,4,5-tetrahydro- 3l-l, 3-benzazepine (g) was added during 20 minutes at 22-26 C with a cooling bath in place. The reaction was stirred for 2.5 hours at room temperature (about 20 C). The reaction mixture was decomposed. by adding water (50ml) at l5-20 C and evaporating the solvent. The residue was dissolvedin ether/water and the ether layer was separated. The ether was washed with diluteHCl and the acid layer was separated. Aqueous sodium hydroxide was added and'the amine isolated in ether afforded an oil. The oil was converted to the hydrochloride which was gummy. Trituration with hot acetone (200ml) afforded a brown solid which later turned blue, melting point' l84l 87 C. Ether was crystals was filtered, melting point l78-l'82 C. The filtrate was evaporated and the gummy, residue was triturated with acetone and the solid filtered, melting point lf-l30 C. The salts so prepared were combined and made basic with NaOH and the free amine was isolated in ether. The oil was distilled to give a colorless amine which afforded a solid hydrochloride from ether. The salt was dissolved in hot isopropanol (125ml), filtered and diluted with ether (125ml). l'm-. mediate crystallization began and the'suspension was stirred for 16 hours at room temperature. The salt was filtered to give a solid melting at l83-l 87 C. I

(+) j 3-(p-Aminophenethyl)-2-methyll.2,4,5- tetrahydro-3H,3-benzazepine (Cpd. 786-737) 2-Methyl-l,2,4,5-tetrahydro 3l-l,3-ben2azepine hydrochloride (10.8 g.) was converted to the free amine and the resulting oil was isolated. The oil was treated with p-nitrophenylacetic acid (10.9 'g') anddicyclohexylcarbodiirnide (13.7 g) in tetrahydrofuran (150 ml) at room temperature for 7 hours. Acetic acid Example 8 was repeated except that amphetamine was substituted for amphetamine to give (-)-3-(p-aminophenethyl )-2-methyll ,2,4 ,5- tetrahydro-3H,3-benzazepine dihydrochlorine [01111 =-1.22(c,o.9 in 11,0)

Calcd. for C ,;H, C|=N= ,O C, 62.33; H, 7.50; Cl,

19.94; N, 7.65. (corrected for 2.9% water found: C, 63.92; H, 7.56; CI, 20.04; N, 7.96.

- EXAMPLE l0.

3-( p-Aminophenethyl l ,2,4,5-tetrahydro-3H,3

.benzazepine. (Cpd. 793-715) A solution of l,2,4,5-tetrahydro-3l-l,3-benzazepine (23 gm) in T.l-l.F. (185 ml) was added to a solution of p-nitrophenylacetic acid (28.2 gm) and dicyclohexylcarbodiimide (35.2 gm) in T.l-l.F. (370 ml). After stirring for 5 hrs at room temperature, acetic acid (3.7 ml) was added and the insolubles were filtered. Evaporation of the filtrate and trituration of the residue with ether afforded a solid which was filtered to give 3-(pnitrophenylacetyl)-l ,2,4,5-tetra-hydro-3H,3-

benzazepine (36 gm). This amide was dissolved in methanol (480 ml) and cone. hydrochloric acid (9.5 ml) was added. The solution was hydrogenated at 50 p.s.i. over 5 percent palladium charcoal (3.2 gm).

Hydrogenation was complete in one hour. Filtration of (1 ml) was added and the insolubles were filtered.

Evaporation of .tbe tetrahydrofuransolution afforded crude 2-me'thyl-3-(p-nitrophenylacetyl )-l ,2,4,5- tetrahydro-3l-l,3-benzazepine. This material was hydrogenated in methanol (350ml) containing conc. hydrochloric acid (7 ml) overv 5. percent palladiumcharcoal (3 g) at 5 0-p.s.i Filtration of the catalyst and evaporation of the solvents afforded a'semi-solid which was dissolved in water (200 ml). Some insolubles were filtered and the filtrate was basifi'ed with dilute sodium hydroxide to givetlie crude amino-amide which was extracted intoichloroform. Evaporation of the solvent afforded the 3-(p-aminophenylacetyl)a2-rnethyl-l,2,4,5, tetrahydro-3H,3+benzazepine as an oil. This oil was dissolved in tetrahydrofuran (200 ml) andadded dropwise to a suspension of lithium aluminum hydride (3.8 g, 0.'l

' m) ir1 tetrahydrofuran (150 ml) during 1.5 hours. The

reaction was refluxed for 5 hours. Decomposition with water and dil. sodium hydroxide solution and'filtration from theinorganic salts gave, on evaporation of the filtrate, an oil; The oil was converted to the dihydrochloridesalt in methanol and the solid was purified (by recrystallization from methanol to give 3- (p-aminophenethyl)-2-methyl l,2;4,5-tetrahydro- 3H.3-benzazepine dihydrochlorde. [al,,=-"=+ l.4l (C, 0. 8S in H,O).

Calcd. for C,,H,,'CI,N,: C, 64.59; H, 7.42; Cl, 20.07;

N, 7.93; found: c, 64.56; H, 7.70; c1, 20.14; N',

EXAMPLE 9.,

the catalyst and evaporation of the solvent afforded the crude'hydrochloride'which was treated with aqueous alkali and again filtered to give 3-(p-amino-phenylacetyl)'l,2,4,S-tetrahydro-3H,3wbenzazepine (24.4 gm). The amine (16.2 gm) was dissolved in tetrahydrofuran (200 ml) and added dropwise to a suspension 'of lithium aluminum hydride (6.6 gm) in tetrahydrofuran (200 ml) during 30 minutes. After refluxing for- 17 hours, the ice-cooled reaction was decomposed by the consecutive addition of water (6.6 ml), 15 percent aq. NaOl-l (6.6 ml) and water (19.6 ml). The salts'were filtered and the solvent evaporated to give a solid (15.3 ,gm). The solid was treated with hydrogen chloride in methanol solution and the precipitated solid was recrystallized from methanol to give 3-(p-aminophenethyl)-1,2,4,5-tetra-hydro-3H,3- berizazepine dihydrochloride. J Calcd. for c n cnm; C, 63.72; H,"7.l3; Cl, 20.90; N, 8.25. foundi c, 6.338, H, 7.46; (31,2091; N,

EXAMPLE 11.

, (+)-3-(p-Aminophenethyl)-8-methoxy-2-methyl l,2,4,5-tetrahydro 3H-,3-ben2azepine dihydrochloride .(Cpd. 786-723) fronrmethanol (500ml) and after 24 hr. the solid precipitate was filtered. Wt 21.6 g. This 'salt was [111 4.8; (C in Concentration of the filtrates from the second and third crystallizations afforded more materials which were. combined and recrystallized twice from methanol to give more of the required salt..Wt==3.8 g. [a]m -5.4; (c=l .00 in H O). The combined salts were dissolved in water and basified with percent sodium hydroxide solution. The amine was isolated by extraction into benzene. Evaporation of the benzene afforded the amine. Wt 10.5 g, yield 25%. A sample of the hydrochloride had [al 26.8"; (c .89 in H20. 8-Methoxy-2-methyl-3-(p-nitrophenylacetyl)- 1,2,4,5-tetrahydro-3H,3-benzazepine I 8-Methoxy-2-methyl- 1 ,2,4,5-tetrahydro-3H ,3-

benzazepine (8 g, .042M) [obtained from its D(+)-tartrate salt with [a],-, 4.93; (c=1.08 in 1120)] was dissolved in tetrahydrofuran (50 ml). A solution of p-nitrophenylacetic v acid (8.35 g,.0464M) in tetrahydrofuran (50 ml) and a solution of dicyclohexylcarbodiimide (10.5 g, .051M) were mixed rapidly and the solution of the benzazepine was immediately added all at once. The stirred reaction mixture .was cooled by a water bath at 20-30 for 20 hr. Acetic acid (1 ml) was added and after 30 min the insoluble dicyclohexyl urea was filtered. The filtrate wasevaporated and the solid residue was triturated with diethyl ether and filtered to give the crude title compound. Wt 12.5 g containing some dicyclohexyl urea. Yield 83 percent. A sample was recrystallized from iso-prOpanoL mp s5-ss; a1.,. 152; (c=0.975 in methanol). 3-(p-Aminophenylacetyl)-8-methoxy-2-methyl- 1,2,4,5-tetrahydro-3H,3-benzazepine 8-Methoxy-2-methyl-3-(p-nitrophenylacety1)- l,2,4,5-tetrahydro-3H,3-benzazepine 12.5 g, (1035M) containing traces of dicyclohexyl urea was dissolved in methanol: cone. HCl (150 ml:3 Ml) and reduced over 5 percent palladium charcoal 1 g) at'50 psi. Thered'uc tion was complete in 30 min and the charcoal was .filtered. The solvent was evaporated from thefiltrate and the residue was redissolved in"-warm water, filtered from the insolubles and basified with excess dil'ute sodium hydroxide solution. The precipitated amine-washolated by extraction into chloroform. Evaporation of-the chloroform and trituration of the residue with isopropyl ether gave a solid which was filtered to 'give the title compound. Wt 9.6 g, yield =85 percent, mp 121- 124. i g

(c ='0.987 in methanol). v 3-(p-Aminophenethyl)-8 -methoxy-2-methyll,2,4,5-tetrahydro-3H,3-benzazepine dihydrochloride -3-(p-Aminophenylacetyl)-8-methoxy-2-methyl l ,2,4.5-tetrahydro-3H,3-benzazepine (9.6 g 0.029M) was dissolved in tetrahydrofuran (100 ml) and added dropwise to a suspension of lithium aluminum hydride (2.2 g, .06M) in tetrahydrofuran (100 ml) during 30 min at gentle reflux in a nitrogen-atmosphere. The reaction was stirred and refluxed for- 17 hr. The icecooled reaction was was decomposed by the consecutive addition of water (2.2 ml), percent sodium hydroxide (2.2 ml) and'water (6.6 ml). After stirring for 30 min the salts were filtered and the filtrate was dried over magnesium sulfate. Evaporation of the dried solvents afiorded an orange gum (Wt 8.8 g)'which was crystallized from iso-propanol (25ml) to give the amine. Wt= 4.9g. The filtrate was evaporated to dryness and the residue (3.9 g) which contained some product and starting material was retreated with lithium aluminum hydride 1 g) in the same manner to give a gum (3.7 g) free of starting material. The combined products were dissolved in methanol (100 ml) and hydrogenchloride was passed into the solution until excess had been added. The methanol solution was diluted with tetrahydrofuran (150 ml) and the mixture was evaporated on the rotatory evaporator to a thick slurry. The solid was filtered and washed with tetrahydrofuran. Wt 8.5 g. This solid was dissolved in hot methanol (35 ml) and charcoaled. The filtrate from the charcoal treatment (40 ml) washeated to reflux and then diluted with tetrahydrofuran (50 ml). The mixture was stirred while cooling for 2 hr. The

. precipitate was filtered 'anddried at l00/6 hr.

' 1,2,4,5tetrahydro-3H,3-benzazepine dihydrochloride (Cpd. 786-722) Y The title compound was prepared by repeating Example l 1, except that D(-)-tartaric acid was used in place of the D(+).tartaric acid of Example 11, [a]s1a' =+l0.9 (C, 1.015. in 11,0).

. l,2,4,5-tetrahydro-3H,3-benzazepine. (Cpd. 793-765) 40 ()-3-(p-Aminophenethyl)-8-methoxy-2methyll,2,4,5-tetrahydro-3H,3-benzazepine dihydrochloride was suspended in chloroform and triethylamine (l2.5 gm') was added. Acetyl chloride (3.76 gm) wasadded to the ice-cooled reaction during 5 minutes and stirred for one hour. The chloroform suspension was washed with water and dried. Evaporationof the chloroform afford a solid 12 gm) which was dissolved in methanol and treated withv hydrogen chloride. The precipated salt was filtered to give (--)-3- p-aectamidophenethyl )-8-methoxy-2-methy1- 1 2,4,5- tetrahydro-3H,3vbenzazepine hydrochloride. [01],? +6.98 0, 1.03 in'H,O).

' Calcd'. for C,,H,,C|N,0,: C, 67.94; H, 7.52; Cl, 9.12;

N 7.20. found: C, 67.99; H, 7.41; Cl, 9.31; N,

TABLE IV Compound |.P.' P MTS Symptomalology Analgesia l Kl il s s/ s l 8 751-226 10 200 3 17 786-737 10 60 10 3 10 786-738 3 60 2O 6 30 793-715 3 60 30 10 v 793-765 v 3 200 -30' 7 10 778-033 7 -.l0 59 23.8 2.00 6.7 786-722 3-10 38 30 2.05 1.4 786-723 33-10 92 21.2 1.34 1.57

. lP =inlraperitoneal route HTD =highcsl tolerated dose LD =median lethal dose PBQ =phehylbenzoquinone writhing PO =oral route SC =subcutaneous route MTS ==mouse tail stimulation I claim: 1. A compound of the formula:

or acid addition salts thereof wherein R is aminophenyl-lower alkyl, lower alkanoylamidophenyl-lower alkyl,

methyl-aminophenyl-lower alkyl, ethylaminophenyl-- 4. The compound of claim 2 which is ()-3-(paminophenethyl 2-melhyl-l ,2,4,5-tetrahydro-3H,3- benzazepine dihydrochloride. v

5. The compound of claim 1 wherein R is paminophenethyl; R is methyl; R is 7-hydroxy, and each of R and R is hydrogen.

6. The compound of claim l wherein -R is paminophenethyl; R is methyhIR is 8- hydroxy, and each ofR and R is hydrogen, l

I 7. The compound of claim 1 wherein R. n paminophenethyl; R is'meth y l; R is -7 -methoxy,-fand each of R and R is hydrogen.

24 8. The compound of claim 1 wherein R is paminophenethyl; R is methyl; R is S-methoxy, and each of R and R is hydrogen.

9. The compound of claim 8 which is (--)-3-(paminophenethyl)-8-methoxy-2-methyl l ,2,4,5- tetrahydro-IiiLB-benzazepine Ill/The compound of claim 8 which is (-l-,)-3S-(paminophenethyl )-8-methoxy-2-methyl-l ,2,4,5- tetrahydro-3H .3-bcnzazepine.

R1. The compound of claim I wherein Ris paminophenethyl; each of'R, R and R is hydrogen, and R is 7-methoxy.

12. 'The compound of claim 11 which is 3-(paraamino phenyl-ethyl)-7-methoxy-l ,2,4,5-tetrahydro-3 H,3-benzazepine dihydrochloride.

13. The compound of claim 1 wherein R is paminophenethyl; each of R, R and R is hydrogen, and R is 7 hydroxy.

14. The compound of claim 1 which is 3-(2-paminophenyl-l1methyl-ethyl)-7 methoxy- 1 ,2,4,5- tetrahydro-3H,3 benzazepine dihydrochlorideQ 15. The compound of claim l wherein R is paminophenethyl and eachflof R, R,- R and R is hydrogen.

16. The compound of claim 1 which is 3-(pacetamidophenethyhl -.,2,4,5-tetrahydro-3H',3-

v benzazepine.

17. The compound of claim I wherein R is pacetamidophenethyl; each of R, R and R is hydrogen, and R is 7-hydroxy.

H8. The compound of claim 1 wherein R is pacetamidophenethyl; each of R, R and R is hydrogen, andR is 7-metlioxy.

19. The compound of claim l8.which is 7-methoky 3-(p-acetamidophenethyl)-l ,2,4,5-tetrahydro-3H,3- benzazepine hydrochloride.

20. The compound of claim 1 wherein R is pacetamidophenethyl; R is methyl; each of R and R is hydrogen; and R is'8-methoxy.

21. The compound of claim 20 which is -3- acetamidophenethyl)-8-methoxy 2-methyl- 1 ,2,4,5 tetrahydro- 3H.3-benzazepine hydrochloride. 

1. A compound of the formula:
 2. The compound of claim 1 wherein R is p-aminophenethyl; R1 is methyl and each of R2, R3 and R4 is hydrogen.
 3. The compound of claim 2 which is (+)-3-(p-aminophenethyl)-2-methyl-1,2,4,5-tetrahydro-3H,3-benzazepine dihydrochloride.
 4. The compound of claim 2 which is (-)-3-(p-aminophenethyl)-2-methyl-1,2,4,5-tetrahydro-3H,3-benzazepine dihydrochloride.
 5. The compound of claim 1 wherein R is p-aminophenethyl; R1 is methyl; R3 is 7-hydroxy, and each of R2 and R4 is hydrogen.
 6. The compound of claim 1 wherein R is p-aminophenethyl; R1 is methyl; R4 is 8-hydroxy, and each of R2 and R3 is hydrogen.
 7. The compound of claim 1 wherein R is p-aminophenethyl; R1 is methyl; R3 is 7-methoxy, and each of R2 and R4 is hydrogen.
 8. The compound of claim 1 wherein R is p-aminophenethyl; R1 is methyl; R4 is 8-methoxy, and each of R2 and R3 is hydrogen.
 9. The compound of claim 8 which is (-)-3-(p-aminophenethyl)-8-methoxy-2-methyl-1,2,4,5-tetrahydro-3H,3 -benzazepine.
 10. The compound of claim 8 which is (+)-3-(p-aminophenethyl)-8-methoxy-2-methyl-1,2,4,5-tetrahydro-3H,3 -benzazepine.
 11. The compound of claim 1 wherein R is p-aminophenethyl; each of R1, R2 and R4 is hydrogen, and R3 is 7-methoxy.
 12. The compound of claim 11 which is 3-(para-amino phenyl-ethyl)-7-methoxy-1,2,4,5-tetrahydro-3H,3-benzazepine dihydrochloride.
 13. The compound of claim 1 wherein R is p-aminophenethyl; each of R1, R2 and R4 is hydrogen, and R3 is 7-hydroxy.
 14. The compound of claim 1 which is 3-(2-p-aminophenyl-1-methyl-ethyl)-7-methoxy-1,2,4,5-tetrahydro-3H,3 -benzazepine dihydrochloride.
 15. The compound of claim 1 wherein R is p-aminophenethyl and each of R1, R2, R3 and R4 is hydrogen.
 16. The compound of claim 1 which is 3-(p-acetamidophenethyl)-1-,2,4,5-tetrahydro-3H,3-benzazepine.
 17. The compound of claim 1 wherein R is p-acetamidophenethyl; each of R1, R2 and R4 is hydrogen, and R3 is 7-hydroxy.
 18. The compound of claim 1 wherein R is p-acetamidophenethyl; each of R1, R2 and R4 is hydrogen, and R3 is 7-methoxy.
 19. The compound of claim 18 which is 7-methoxy-3-(p-acetamidophenethyl)-1,2,4,5-tetrahydro-3H,3-benzazepine hydrochloride.
 20. The compound of claim 1 wherein R is p-acetamidophenethyl; R1 is methyl; each of R2 and R3 is hydrogen, and R4 is 8-methoxy. 